Damaged brass / headspace / case separation

[Peter S]

If you have the barrel set back the breach face should be machined back .0052. Thats
52 thousandths. The way it is calculated is the threaded shank is .625 long ÷ 12 threads per inch= .0052. One complete revolution to get everything back top dead center.

That's totally wrong. The length of the threaded shank does not come into play. It is 12 threads per inch so one revolution of the barrel moves it 1.000/12=.083

 

[whcoyote]

Peter is correct!